We study the spectrum of scalar-isoscalar excitations in the color-flavor locked phase of dense quark matter. The sigma meson in this phase appears as a four-quark state (of diquark and antidiquark) with a well-defined mass and extremely small width, as a consequence of its small coupling to two pions. The quark particle/hole degrees of freedom also contribute significantly to the correlator just above the threshold $2\Delta ,$ where $\Delta$ is the superconducting gap.

• Received 4 November 2002

DOI:https://doi.org/10.1103/PhysRevC.67.045202